Presume to be true (7)

I think it could be either:

Which length description are you looking for?:

4,2,4

suppose

(Other definitions for suppose that I've seen before include "Put forward - imagine" , "'Believe, perhaps on uncertain grounds (7)'" , "Presume" , "Assume without proof" , "Reckon, think" .)

I've seen this clue in The Mirror.

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